On Oct. 5, 2014, in Dallas, members of the Cleaning Guys Haz Mat clean up company work on sanitizing the apartment where Ebola patient Thomas Eric Duncan was staying before being admitted to a hospital.Joe Raedle/Getty Images

The condition of a man diagnosed with the Ebola virus in Dallas has turned critical, officials at Texas Health Presbyterian Hospital said Saturday, according to the New York Daily News.

The man, Thomas Duncan, 42, who arrived at the hospital on Sept. 28, was previously listed in serious but stable condition.

The report about his worsening condition comes after his family said Duncan had become “too sick to speak” Friday, the News says. He had recently traveled to West Africa, where the disease has killed thousands.

The Centers for Disease Control and Prevention is monitoring 50 people who came in contact with Thomas, although they are not in hospital isolation, the report says.

Meanwhile, a patient with Ebola-like symptoms in Washington, D.C., has not been diagnosed with the disease, the Washington Post says. Further, the Post notes, no patients who were under evaluation for Ebola at Washington-area hospitals have the deadly disease.

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About 250 passengers aboard a plane in Newark, N.J., Saturday were quarantined for nearly two hours amid an Ebola scare, according to the New York Daily News. But two passengers on a United Airlines flight from Brussels were taken to a Newark hospital for a minor illness that was not Ebola, the News writes.